GE Multilin 850 Instruction Manual page 356

PROTECTION
4–224
G0 REV REACH
Range: -500.00 to 500.00 mS in steps of 0.01 mS
Default: -1.00 mS
This setting defines the pickup level of protection criterion based on the neutral
conductance. Neutral Admittance Ground Fault protection will operate after the set
Pickup Delay time when the neutral conductance quantity, G0, lies below the reach level
defined by this setting. This setting is not applicable when the Direction setting is set to
Forward.
Depending on pick-up threshold (G0) and directional settings, conductance
characteristics are as follows:
jB
Block
G0 Fwd
Reach
Forward Direction Operate/Block Characteristic
jB
Operate
Block
G0 Fwd
G0 Rev
Reach Reach
Non-directional Operate/Block Characteristic
when G0 Fwd Reach ≥ G0 Rev Reach
B0 FWD REACH
Range: -500.00 to 500.00 mS in steps of 0.01 mS
Default: 1.00 mS
This setting defines the pickup level of the protection criterion based on the neutral
susceptance. Neutral Admittance Ground Fault protection will operate after the set
Pickup Delay time when the neutral susceptance quantity, B0, exceeds this setting. This
setting is not applicable when the Direction setpoint is set as Reverse.
Operate Operate
Block
G
G0 Rev
Reach
Reverse Direction Operate/Block Characteristic
Operate
Block
G
G0 Fwd
Reach
Non-directional Operate/Block Characteristic
when G0 Fwd Reach < G0 Rev Reach
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
jB
G
jB
Block
Operate
G
G0 Rev
Reach